I have 50% grey and get beautiful results with henna, which I did originally over professional colour.
The main thing is you need to ensure it 100% pure henna.. not a compound henna that could have added metallic salt dyes which WILL react with your previous colour.
Your greys will look amazingly bright at first (like an orange lollipop in the sun!) and within 2-3 days will oxidize to a gorgeous red shade.. My avatar is accurate, but keep in mind my natural colour is a very light reddish brown.. If your natural color is darker, you will have darker results with awesome bright highlights and beautiful dimension as your hair grows out.
Depending on your hair type you may find yourself with much looser curl as you continue to henna on a regular basis. I went from 3b to 2b. Though losing so much curl seems tragic, I have 'Mermaid Hair' now and actually love it. It's gotten so much longer and is so shiny. The compliments are fun, too.
If you choose to go ahead, i can recommend buying from Indian grocery stores. I bought a one kilo bag of Rajasthani Henna for $10 at one recently and I mix up the whole thing, let the pigment release, then bagged it into 4 applications and froze it. (I have long hair and need 250 grams per application). So that's $2.50 per application! Just make sure what you buy is 'body art quality'. They often have pictures of decorated hands on them and the word 'Mehandi' on the package.
Or you can buy it online for $7 per 100 grams or $55 per kilo.. plus shipping.
Do your research.. it is so worth it. I think of all the money I wasted and all the damage, and all the pollution I created.. and chemicals I put on my body.. It makes me sick!
Last edited by SusieSuze; 06-23-2012 at 01:50 PM.